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CVE-2026-77077n8n before 1.123.69 Remote Code Execution via EventEmitter Prototype Pollution

Description

n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis functions but not internal module constructors such as EventEmitter, allowing an authenticated user with Code node access to exploit prototype pollution to execute arbitrary commands within the runner container. Because the polluted prototype is a process-wide object, the corruption persists across other tenants' Code node executions on the same shared runner. On v1.x instances without task runners enabled, Code node JavaScript runs directly in the main n8n process, where the impact could be higher.

Timeline

  1. ID reserved

    By VulnCheck

  2. Published

  3. · 1 day later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-77077, by who scored it
Scored byCVSSScoreVector
VulnCheckCNA (assigner)4.0High7.2CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
NVDNVD · Analyzed4.0High7.2CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.56% · top 53% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.

Affected products

  • n8n-io · n8n

    • affected < 1.123.69
    • unaffected 1.123.69

  • n8n-io · n8n

    • affected 2.34.0 – < 2.34.1
    • unaffected 2.34.1

  • n8n-io · n8n

    • affected 2.0.0 – < 2.33.4
    • unaffected 2.33.4

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .